void ossimXmlNode::findChildNodes(const ossimString& xpath,
ossimXmlNode::ChildListType& result)const
{
//***
// Scan for trivial result (no children owned):
//***
if (theChildNodes.size() == 0)
return;
//***
// Make a copy to manipulate:
//***
ossimString rel_xpath (xpath);
if (rel_xpath.empty())
return;
//---
// First verify that this is not an absolute path:
//---
if (rel_xpath[static_cast<std::string::size_type>(0)] ==
XPATH_DELIM[static_cast<std::string::size_type>(0)])
{
ossimNotify(ossimNotifyLevel_WARN)
<< "WARNING: ossimXmlNode::findChildNodes\n"
<< "Only relative XPaths can be searched from a node. "
<< "Returning null list...\n";
return;
}
//***
// Read the desired tag from the relative xpath
//***
ossimString desired_tag (rel_xpath);
if (rel_xpath.contains(XPATH_DELIM))
desired_tag = rel_xpath.before(XPATH_DELIM);
ossimString sub_xpath (rel_xpath.after(XPATH_DELIM));
//***
// Loop over all child nodes for match:
//***
ossimXmlNode::ChildListType::const_iterator child_iter = theChildNodes.begin();
while(child_iter != theChildNodes.end())
{
if ((*child_iter)->getTag() == desired_tag)
{
if (sub_xpath.empty())
{
//***
// This was the final target node, simply append to the result:
//***
result.push_back(*child_iter);
}
else
{
//***
// This match identifies a possible tree to search given the
// remaining xpath (sub_xpath). Query this child node to search
// its tree for the remaining xpath:
//***
(*child_iter)->findChildNodes(sub_xpath, result);
}
}
//***
// Proceed to next child:
//***
child_iter++;
}
}
ossimRefPtr<ossimXmlNode> ossimXmlNode::findFirstNode(const ossimString& xpath)
{
if(theChildNodes.size() < 1) return 0;
//
// Make a copy to manipulate:
//
ossimString rel_xpath (xpath);
if (rel_xpath.empty())
return 0;
//
// First verify that this is not an absolute path:
//
if (rel_xpath[static_cast<std::string::size_type>(0)] ==
XPATH_DELIM[static_cast<std::string::size_type>(0)])
{
ossimNotify(ossimNotifyLevel_WARN)
<< "WARNING: ossimXmlNode::findChildNodes\n"
<< "Only relative XPaths can be searched from a node. "
<< "Returning null list...\n";
return 0;
}
//
// Read the desired tag from the relative xpath
//
ossimString desired_tag (rel_xpath);
if (rel_xpath.contains(XPATH_DELIM))
desired_tag = rel_xpath.before(XPATH_DELIM);
ossimString sub_xpath (rel_xpath.after(XPATH_DELIM));
ossimRefPtr<ossimXmlNode> result = 0;
//
// Loop over all child nodes for match:
//
ossimXmlNode::ChildListType::iterator child_iter = theChildNodes.begin();
while((child_iter != theChildNodes.end())&&
(!result.valid()))
{
if ((*child_iter)->getTag() == desired_tag)
{
if (sub_xpath.empty())
{
return *child_iter;
}
else
{
//
// This match identifies a possible tree to search given the
// remaining xpath (sub_xpath). Query this child node to search
// its tree for the remaining xpath:
//
result = (*child_iter)->findFirstNode(sub_xpath);
}
}
//
// Proceed to next child:
//
++child_iter;
}
return result;
}
void ossimXmlDocument::findNodes(const ossimString& arg_xpath,
vector<ossimRefPtr<ossimXmlNode> >& result) const
{
//
// First verify the root node exists:
//
if (!theRootNode.valid())
{
if (traceDebug())
{
ossimNotify(ossimNotifyLevel_DEBUG)
<< "WARNING: ossimXmlDocument::findNodes,\n"
<< "No root node has been instantiated. Returning null "
<< "node list..." << endl;
}
return;
}
//
// Make a copy to manipulate:
//
ossimString xpath (arg_xpath);
if (xpath.empty())
return;
//
// Check if absolute path:
//
if (xpath[static_cast<std::string::size_type>(0)] !=
XPATH_DELIM[static_cast<std::string::size_type>(0)])
{
if (traceDebug())
{
ossimNotify(ossimNotifyLevel_DEBUG)
<< "WARNING: ossimXmlDocument::findNodes\n"
<< "Only absolute XPaths are supported. Returning null "
<< "node list..." << endl;
}
return;
}
//
// Check that root tag matches path root:
//
ossimString rel_xpath (xpath.after(XPATH_DELIM));
ossimString root_tag (rel_xpath);
if (root_tag.contains(XPATH_DELIM))
root_tag = rel_xpath.before(XPATH_DELIM);
if (root_tag != theRootNode->getTag())
{
if (traceDebug())
{
ossimNotify(ossimNotifyLevel_DEBUG)
<< "WARNING: ossimXmlDocument::findNodes\n"
<< "XPath's root node <"<<root_tag<<"> does not match the "
<< "stored root node's tag <" << theRootNode->getTag() << ">. "
<< "Returning null node list..." << endl;
}
return;
}
//
// If the root node was the requested node, return it alone:
//
rel_xpath = rel_xpath.after(XPATH_DELIM);
if (rel_xpath.empty())
{
result.push_back(theRootNode);
return;
}
//
// Pass the node request on to the root node with the relative path:
//
theRootNode->findChildNodes(rel_xpath, result);
}